Hey Aniketh! I recently appeared for Node.js interview. Here are some topics which I think you must go through:-
- Internal working of Node.js i.e; concept of event loop
- Callbacks and how efficiently you can skip callback hells
- Few modules like async, express, mongoose, lodash, socket.io, gulp, etc
- Build your own project or try out some microservices in Node.js (best way to learn)
Docs reference:-
- Node.js async processing
- 30 days of Node
- Node.js video tutorials
All the best for your upcoming interviews.